You can help by taking action. Donate to a charity. Spread word. Stand up for what is right.
Here are some places you can donate to. You can also try other sources to help out with from other youtubers or influencers have mentioned.
https://www.knowyourrightscamp.com/legal is from The Kaepernick Foundation set up to help the protestors with lawyers
https://www.joincampaignzero.org/ is a reliable campaign dedicated to ending police violence in the United States